Ulcerative colitis (UC), one forms of chronic inflammatory bowel disease (IBD), is characterized by recurrent inflammation, and Renshen Baidu Powder (RSBDP) is often used as a traditional Chinese medicine prescription for treating of UC, but the pharmacological mechanisms remains unclear. This research aims to explore the mechanisms of RSBDP in the treatment of UC based on network pharmacology. Through multiple databases collected the compounds and targets, and constructed the network. The crossover genes enrichment analysis were performed by protein-protein interaction (PPI) construction and Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG). Finally, 181 compounds and 266 targets were obtained. Potential candidate ingredients mainly include phytosterols, flavonoids, and coumarins, all of which have anti-inflammatory activities. GO and KEGG enrichment analysis suggested that RSBDP have anti-inflammatory and immunomodulatory effects. The effect of RSBDP on UC might be achieved by regulating the balance of cytokines (i.e., IL-6, TNF, IL-1) and the downstream mediators (i.e., STAT1, STAT3) in the immune system. And inflammation-, immune- and hypoxic-related pathways, like TNF, Toll-like receptors and HIF-1 signaling pathway. These results provide a theoretical basis for studying the effective substances of RSBDP in the treatment of UC and their mechanism of action for further research.